Axial force adjusting column, and construction method for structure

Abstract

To increase the compression-directional load that is placed on a corner part column arranged at a corner part of a structure, comprising a plurality of columns arranged in the width direction and depth direction, as compared with when all columns have the same constitution.SOLUTION: An axial force adjusting column is arranged in a circumference of a corner part column arranged at a corner part among a plurality of columns constituting a structure and arranged in the width direction and depth direction, and also divided into a lower column and an upper column. The axial force adjusting column comprises an elastic member which is provided between the lower column and upper column, and can elastically deform vertically with the structure being constructed, and a coupling member which rigidly couples the lower column and upper column with the structure constructed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an axial force adjustment column and a construction method of a structure.

Background Art

[0002] The seismic isolation building described in Patent Document 1 is a seismic isolation building in which a seismic isolation rubber device and a sliding bearing device are respectively distributed and interposed between the lower part and the upper part of the building according to the column arrangement, and a rigidity adjustment means capable of reducing the vertical rigidity is interposed in the column at the position where the sliding bearing device is installed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a structure including a plurality of columns arranged in the width direction and the depth direction. The compressive load applied to the corner columns arranged at the corners away from the center of the structure is smaller than the compressive load applied to the central columns arranged at the center of the structure. Therefore, during an earthquake or the like, a tensile load acts on the corner columns, and a force to be pulled out from the ground may be applied to the corner columns.

[0005] The problem of the present disclosure is to increase the compressive load applied to the corner columns arranged at the corners of the structure as compared with the case where all the columns have the same configuration in a structure including a plurality of columns arranged in the width direction and the depth direction.

Means for Solving the Problems

[0006] The axial force adjustment column according to the first aspect is arranged around a corner column arranged at a corner of a structure among a plurality of columns arranged in the width direction and the depth direction constituting the structure, and is divided into a lower column and an upper column. The axial force adjustment column is provided with an elastic member that is provided between the lower column and the upper column and is elastically deformable in the vertical direction in a state where the structure is being constructed, and a coupling member that rigidly couples the lower column and the upper column in a state where the structure has been constructed.

[0007] According to the above aspect, in a state where the structure is being constructed, since the elastic function of the elastic member is effective, the upper column constituting the axial force adjustment column is allowed to move relatively in the vertical direction with respect to the lower column. Further, in a state where the structure has been constructed, the coupling member rigidly couples the lower column and the upper column. As a result, the load in the compression direction applied to the axial force adjustment column is reduced, and the load in the compression direction applied to the corner column of the structure is increased.

[0008] In this way, in a structure including a plurality of columns arranged in the width direction and the depth direction, compared with the case where all the columns have the same configuration, the load in the compression direction applied to the corner column arranged at the corner of the structure can be increased.

[0009] The construction method of the structure according to the second aspect includes a first step of constructing an axial force adjustment column, which is divided into a lower column and an upper column and is provided with an elastic member that is elastically deformable in the vertical direction between the lower column and the upper column, around a corner column arranged at a corner of the structure in a state where a structure including a plurality of columns arranged in the width direction and the depth direction is being constructed, and a second step of rigidly coupling the lower column and the upper column in a state where the structure has been constructed.

[0010] According to the above aspect, in the first step of constructing the structure, since the elastic function of the elastic member is effective, the upper column constituting the axial force adjustment column is allowed to move relative to the lower column in the vertical direction. Further, in the second step where the structure is constructed, the lower column and the upper column are rigidly connected. As a result, the load in the compression direction applied to the axial force adjustment column is reduced, and the load in the compression direction applied to the corner column of the structure is increased.

[0011] In this way, in a structure including a plurality of columns arranged in the width direction and the depth direction, compared with the case where all the columns have the same configuration, the load in the compression direction applied to the corner column arranged at the corner of the structure can be increased.

[0012] The method for constructing a structure according to the third aspect is characterized in that, in the first step of the method for constructing a structure according to the second aspect, the axial force adjustment column is constructed adjacent to the corner column in the width direction and adjacent to the corner column in the depth direction.

[0013] According to the above aspect, compared with the case where the axial force adjustment column is constructed only adjacent to the corner column in the width direction, the load in the compression direction applied to the corner column arranged at the corner of the structure can be effectively increased.

Advantages of the Invention

[0014] According to the present disclosure, in a structure including a plurality of columns arranged in the width direction and the depth direction, compared with the case where all the columns have the same configuration, the load in the compression direction applied to the corner column arranged at the corner of the structure can be increased.

Brief Description of the Drawings

[0015]

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DETAILED DESCRIPTION OF THE INVENTION

[0016] An example of the axial force adjustment column according to the embodiment of the present disclosure and the construction method of the structure will be described with reference to FIGS. 1 to 9. The arrow H shown in each figure indicates the vertical direction, which is the up-and-down direction of the structure in which the axial force adjustment column is used. The arrow W shown in each figure indicates the horizontal direction, which is orthogonal to the arrow H and is the width direction of the structure. The arrow D shown in each figure indicates the horizontal direction, which is orthogonal to the arrows H and W and is the depth direction of the structure. First, the structure in which the axial force adjustment column is used will be described.

[0017] (Structure 100) As shown in FIGS. 1 and 2, the structure 100 is a steel frame structure (S structure) in the shape of a rectangular parallelepiped extending in the vertical direction. A base seismic isolation layer 104 is formed between the structure 100 and the concrete foundation 102. A plurality of seismic isolation devices 106 are provided in the base seismic isolation layer 104, and the structure 100 is supported by the plurality of seismic isolation devices 106.

[0018] The structure 100 consists of multiple floors (multiple layers). As shown in FIG. 3, the structure 100 is provided with a plurality of columns 10 having a rectangular cross-section arranged in the width direction and the depth direction.

[0019] The plurality of columns 10 are steel pipe columns having a rectangular tubular shape, and the outer shapes of the columns 10 are the same. The columns 10 are divided into corner columns 10a, axial force adjustment columns 10b, central columns 10c, central side columns 10d, and intermediate columns 10e. The corner columns 10a are arranged at the corners of the structure 100, and the axial force adjustment columns 10b are arranged adjacent to the corner columns 10a in the width direction and the depth direction. Further, the central columns 10c are arranged at the center of the structure 100, and the central side columns 10d are arranged so as to surround the central columns 10c. The intermediate columns 10e are arranged outside the structure 100 and sandwiched between a pair of axial force adjustment columns 10b. Here, in this embodiment, the corner column 10a is the column 10 arranged farthest from the central column 10c.

[0020] The corner columns 10a, the central columns 10c, the central side columns 10d, and the intermediate columns 10e have the same configuration.

[0021] (Principal part configuration) Next, the axial force adjustment column 10b will be described. As shown in FIGS. 1 and 2, an axial force adjustment part 12 is provided in the part of the axial force adjustment column 10b that constitutes the first floor.

[0022] Specifically, the axial force adjustment column 10b is divided into a lower column 14 and an upper column 16 at the first floor part. Further, the axial force adjustment column 10b includes an axial force adjustment part 12 disposed so as to be sandwiched between the lower column 14 and the upper column 16.

[0023] Furthermore, as shown in FIGS. 4 and 5, the axial force adjustment column 10b includes a restraining member 30 that suppresses the upper column 16 from tilting with respect to the lower column 14 in a state where the structure 100 is under construction, and a coupling member 18 (see FIG. 7) that rigidly couples the lower column 14 and the upper column 16 in a state where the structure 100 has been constructed.

[0024] In this embodiment, the "state where the structure is under construction" means a state where the construction of the building frame is incomplete, and the "state where the structure has been constructed" means a state where the construction of the building frame of all floors has been completed.

[0025] 〔Axial force adjustment part 12〕 As shown in FIGS. 4 and 5, the axial force adjustment part 12 includes a pedestal part 20 having a base end portion attached to the lower column 14 and protruding toward the upper column 16 side, and a pedestal part 22 having a base end portion attached to the upper column 16 and protruding toward the lower column 14 side. Further, the axial force adjustment part 12 includes an elastic part 26 sandwiched between the pedestal part 20 and the pedestal part 22. The elastic part 26 is an example of an elastic member.

[0026] - Pedestal part 20 - As shown in FIGS. 4 and 5, the pedestal part 20 is formed using a plurality of steel plates, and includes a cross rib 20a extending in the vertical direction and a top plate 20b attached to the upper end of the cross rib 20a with the plate thickness direction being the vertical direction. Further, a notch part (not shown) into which a columnar shaft member 22c, which will be described later and is provided on the pedestal part 22, can be inserted is formed in the central part of the pedestal part 20.

[0027] Then, as shown in FIG. 6, the base end portion of the cross rib 20a is inserted into the lower column 14, and the end portion of the cross rib 20a is attached to the inner peripheral surface of the lower column 14 by welding.

[0028] - Pedestal part 22 - As shown in FIGS. 4 and 5, the pedestal portion 22 is formed using a plurality of steel plates, and includes a cross rib 22a extending in the vertical direction and a top plate 22b attached to the lower end of the cross rib 22a with the plate thickness direction being the vertical direction. Further, the pedestal portion 22 includes a columnar shaft member 22c formed of steel material and extending downward from the center of the top plate 22b. By inserting this columnar shaft member 22c into a notch portion (not shown) formed in the pedestal portion 20, displacement of a plurality of disc springs 28, which will be described later, in the horizontal direction is suppressed.

[0029] Then, as shown in FIG. 6, the base end portion of the cross rib 22a is inserted into the upper column 16, and the end portion of the cross rib 22a is attached to the inner peripheral surface of the upper column 16 by welding.

[0030] -Elastic portion 26- As shown in FIGS. 4 and 5, the elastic portion 26 is disposed so as to be sandwiched between the top plate 20b and the top plate 22b, and is configured to include a plurality of disc springs 28 stacked in the vertical direction. The elastic portion 26 is elastically deformable by a load from the vertical direction, and in the state where the structure 100 is being constructed, the elastic portion 26 is prevented from bottoming out.

[0031] -Restraining member 30- As shown in FIGS. 4 and 5, the restraining member 30 includes an erection piece 32 attached to the outer peripheral surface of the lower column 14 and an erection piece 34 attached to the outer peripheral surface of the upper column 16. Further, the restraining member 30 includes a connecting member (not shown) that connects the erection piece 32 and the erection piece 34.

[0032] With this configuration, in the state before the lower column 14 and the upper column 16 are rigidly joined, the restraining member 30 suppresses the inclination of the upper column 16 with respect to the lower column 14, and allows the upper column 16 to move relative to the lower column 14 in the vertical direction.

[0033] -Coupling member 18- The connecting member 18 is formed using a steel plate and is sandwiched between the end faces of the lower column 14 and the upper column 16 as shown in FIG. 7. Specifically, four connecting members 18 are provided and are rectangular in shape when viewed in the plate thickness direction. The connecting member 18 surrounds the axial force adjusting portion 12 from the outside while being sandwiched between the end faces of the lower column 14 and the upper column 16, and is joined to the lower column 14, the upper column 16, and the adjacent connecting member 18 by welding.

[0034] In this configuration, the connecting member 18 is sandwiched between the end faces of the lower column 14 and the upper column 16 and is joined to each member by welding, so that the lower column 14 and the upper column 16 are rigidly connected. In other words, the connecting member 18 rigidly connects the lower column 14 and the upper column 16.

[0035] Note that in this embodiment, when the lower column 14 and the upper column 16 are rigidly connected, the erection piece 32 (see FIG. 4) is removed from the lower column 14, and the erection piece 34 (see FIG. 4) is removed from the upper column 16. In other words, the suppression member 30 is removed from the lower column 14 and the upper column 16.

[0036] (Construction method of the structure 100) Next, the construction method of the structure 100 will be described while comparing it with the construction method of the structure 200 according to the comparative form.

[0037] First, the configuration of the structure 200 constructed by the construction method of the structure 200 according to the comparative form will be mainly described for the parts different from the structure 100. As shown in FIG. 8, the structure 200 is not provided with the axial force adjusting column 10b, and the columns 10 constituting the structure 200 are the corner column 10a, the central column 10c, the central side column 10d, and the intermediate column 10e, and the adjacent column 10f arranged adjacent to the corner column 10a in the width direction and the depth direction. Further, the corner column 10a, the central column 10c, the central side column 10d, the intermediate column 10e, and the adjacent column 10f have the same configuration.

[0038] Then, for the structures 100 and 200, columns, beams, and floors are constructed from the lower floor to the upper floor. In other words, the entire building structure is constructed (first step). That is, in the first step of the construction method of the structure 200, columns 10 with the same configuration are arranged throughout, and the entire building is constructed. On the other hand, in the first step of the construction method of the structure 100, axial force adjustment columns 10b are arranged adjacent to the corner columns 10a arranged at the corners of the structure 100 in the width direction and the depth direction, and the entire building is constructed while allowing elastic deformation of the elastic part 26 of the axial force adjustment column 10b.

[0039] Here, in the structure 100, until the construction of the entire building structure is completed, the upper column 16 is allowed to move relative to the lower column 14 in the vertical direction. In other words, in the state of constructing the structure 100, elastic deformation of the elastic part 26 shown in FIG. 4 is allowed. For this reason, in the state of constructing the structure 100, due to the compressive load (axial force) applied to the upper column 16 of the axial force adjustment column 10b, the elastic part 26 elastically deforms, and the distance between the lower column 14 and the upper column 16 becomes shorter compared to the distance between the lower column 14 and the upper column 16 before the compressive load is applied.

[0040] And in the structure 100, as shown in FIG. 7, in the state where the construction up to the upper floor is completed, while maintaining the relative position between the lower column 14 and the upper column 16, a coupling member 18 is attached between the end face of the lower column 14 and the end face of the upper column 16 (second step). That is, in the second step of the construction method of the structure 100, the lower column 14 and the upper column 16 are rigidly coupled by the coupling member 18, and the upper column 16 cannot move relative to the lower column 14. In other words, in the state where the structure is constructed, the elastic function of the elastic part 26 becomes invalid.

[0041] Note that since all the columns 10 provided in the structure 200 do not have elastic parts, the specific steps in the construction method of the structure 100 described above are not provided.

[0042] As described above, all the columns 10 provided in the structure 200 are columns without elastic parts. Therefore, in the structure 200, in the state where the structure 200 is constructed, as shown in FIG. 9(B), relatively large loads in the compression direction are applied to the central column 10c and the central side column 10d. Further, relatively small loads in the compression direction are applied to the corner column 10a. Also, medium-level loads in the compression direction are applied to the adjacent column 10f and the intermediate column 10e. Note that in FIGS. 9(A) and 9(B), a denser dot pattern indicates a higher load in the compression direction compared to a sparser dot pattern.

[0043] On the other hand, in the structure 100 according to the present embodiment, in the state where the structure 100 is constructed, that is, in the state where the structure is constructed and the lower column 14 and the upper column 16 are rigidly connected by the connecting member 18, as shown in FIG. 9(A), relatively large loads in the compression direction are applied to the central column 10c and the central side column 10d. Further, relatively small loads in the compression direction are applied to the axial force adjustment column 10b. Also, medium-level loads in the compression direction are applied to the corner column 10a and the intermediate column 10e.

[0044] In this way, relatively small loads in the compression direction are applied to the corner column 10a of the structure 200, and medium-level loads in the compression direction are applied to the corner column 10a of the structure 100. That is, the load in the compression direction applied to the corner column 10a of the structure 100 becomes larger compared to the load in the compression direction applied to the corner column 10a of the structure 200.

[0045] This is because in the state of constructing the structure 100, the elastic function of the elastic part 26 of the axial force adjustment column 10b is effective, so the vertical relative movement between the upper column 16 and the lower column 14 of the axial force adjustment column 10b is allowed. Therefore, the load in the compression direction applied to the axial force adjustment column 10b of the structure 100 becomes smaller compared to the load in the compression direction applied to the adjacent column 10f of the structure 200. Thus, the load in the compression direction applied to the corner column 10a of the structure 100 becomes larger compared to the load in the compression direction applied to the corner column 10a of the structure 200.

[0046] That is, when the elastic part 26 is elastically deformed, the compressive load that should have been applied to the axial force adjustment column 10b is applied to the corner column 10a. As a result, the compressive load applied to the corner column 10a of the structure 100 becomes larger than the compressive load applied to the corner column 10a of the structure 200.

[0047] (Summary) As described above, in the axial force adjustment column 10b, the axial force adjustment column 10b is arranged next to the corner column 10a, and in the state where the structure 100 is constructed, the lower column 14 and the upper column 16 are rigidly connected by the connecting member 18. Thereby, in a structure including a plurality of columns arranged in the width direction and the depth direction, compared with all the columns 10 of a similar structure 200, the compressive load applied to the corner column 10a arranged at the corner of the structure 100 can be increased.

[0048] Also, in the construction method of the structure 100, in the first step, an axial force adjustment column 10b is arranged next to the corner column 10a arranged at the corner of the structure 100 including a plurality of columns 10 arranged in the width direction and the depth direction, and the entire layer is constructed while allowing elastic deformation of the elastic part 26 of the axial force adjustment column 10b. Further, in the second step, the lower column 14 and the upper column 16 are rigidly connected using the connecting member 18. Thereby, in a structure including a plurality of columns arranged in the width direction and the depth direction, compared with all the columns 10 of a similar structure 200, the compressive load applied to the corner column 10a arranged at the corner of the structure 100 can be increased.

[0049] Also, in the construction method of the structure 100, by increasing the compressive load applied to the corner column 10a arranged at the corner of the structure 100, during an earthquake or the like, a tensile load acts on the corner column 10a, and the force of being pulled out from the ground can be suppressed from being applied to the corner column 10a.

[0050] Further, in the construction method of the structure 100, in the first step, axial force adjustment columns 10b are respectively arranged adjacent to the corner column 10a in the width direction and the depth direction. Therefore, compared with the case where the axial force adjustment column 10b is arranged only adjacent to the corner column 10a in the width direction, the compressive load applied to the corner column 10a arranged at the corner of the structure 100 can be effectively increased.

[0051] Although the present disclosure has been described in detail with respect to specific embodiments, it is obvious to those skilled in the art that the present disclosure is not limited to such embodiments, and various other embodiments can be adopted within the scope of the present disclosure. For example, in the above embodiment, as shown in FIG. 9(A), in the structure 100, a relatively small compressive load is applied to the axial force adjustment column 10b, and a medium-level compressive load is applied to the corner column 10a. However, the load applied to the corner column 10a may be equal to the load applied to the axial force adjustment column 10b, or the load applied to the corner column 10a may be smaller than the load applied to the axial force adjustment column 10b. It is only necessary that the load applied to the corner column 10a of the structure 100 in the present embodiment is larger than the load applied to the corner column 10a of the structure 200 according to the comparative form.

[0052] Further, in the above embodiment, the rectangular structure 100 as viewed from above is taken as an example for explanation, but the structure may not be rectangular as viewed from above. It is only necessary that the axial force adjustment column 10b is arranged around the column that is farthest from the column arranged at the center of the structure.

[0053] Further, in the above embodiment, the structure 100 is of S-type, but it may also be of RC-type, SRC-type, or constructed by other construction methods. It is only necessary to have a plurality of columns arranged in the width direction and the depth direction.

[0054] Further, in the above embodiment, the disc spring 28 is used for the elastic part 26 of the axial force adjustment column 10b, but a compression coil spring or the like may be used as the elastic member.

[0055] In addition, in the above-described embodiment, the elastic portion 26 is configured not to butt against the bottom while the structure is being constructed, but it may butt against the bottom. However, in this case, compared with the case where the elastic portion 26 does not butt against the bottom, the effect of increasing the load in the compression direction applied to the corner column 10a is reduced.

Explanation of Reference Numerals

[0056] 10 Column 10a Corner Column 10b Axial Force Adjusting Column 14 Lower Column 16 Upper Column 18 Coupling Member 26 Elastic Portion (an example of an elastic member) 100 Structure

Claims

1. Among a plurality of columns arranged in the width direction and the depth direction that constitute a structure, an axial force adjustment column that is arranged around a corner column arranged at a corner of the structure and is divided into a lower column and an upper column, an elastic member provided between the lower column and the upper column and capable of elastic deformation in the vertical direction in a state where the structure is being constructed; a connecting member that rigidly connects the lower column and the upper column in a state where the structure has been constructed; An axial force adjustment column comprising the above.

2. In a state where a structure including a plurality of columns arranged in the width direction and the depth direction is being constructed, an axial force adjustment column that is divided into a lower column and an upper column and includes an elastic member capable of elastic deformation in the vertical direction between the lower column and the upper column is constructed around a corner column arranged at a corner of the structure. A first step; A second step of rigidly connecting the lower column and the upper column in a state where the structure has been constructed; A construction method for a structure comprising the above.

3. In the first step, the axial force adjustment column is constructed adjacent to the corner column in the width direction and adjacent to the corner column in the depth direction. The construction method for a structure according to Claim 2.

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